Update README.md

Author: JoseAntFer

README.md

@@ -1,7 +1,7 @@
 # TriangleMeshDistance
 Header only, single file, simple and efficient C++ library to compute the signed distance function to a triangle mesh.
 
-The distance computation to the triangle collection is accelerated with a sphere bounding volume hierarchy. The signed of the distance is resolved with the method presented in *"Generating Signed Distance Fields From Triangle Meshes"* by Bærentzen, Andreas & Aanæs, Henrik. (2002).
+The distance computation to the triangle collection is accelerated with a sphere bounding volume hierarchy. The sign of the distance is resolved with the method presented in *"Generating Signed Distance Fields From Triangle Meshes"* by Bærentzen, Andreas & Aanæs, Henrik. (2002).
 
 ## Example
 ```cpp
@@ -24,7 +24,6 @@ std::cout << "Nearest triangle index: " << result.triangle_id << std::endl;
 
 
 ## What you need to know about TriangleMeshDistance
-- `TriangleMeshDistance` keeps a copy of the vertex and triangle data passed as input.
+- `TriangleMeshDistance` keeps an internal copy of the vertex and triangle data.
 - Additionally, the pseudonormals required to compute signed distances are calculated and stored at building time.
 - `TriangleMeshDistance` can be declared empty and constructed multiple times with different meshes. This can potentially reuse memory allocations.
--